3.1 quake shakes Imperial County

The magnitude-3.1 temblor struck at 8:56 p.m. and was centered 23 miles south-southeast of Calexico, according to a report from the California Institute of Technology in Pasadena. Calexico is about 90 miles east of San Diego.

A dispatcher for the Imperial County Sheriff's Department said there were no reports of damage or injuries.